Need more office space? How about outer space? NASA opened its astronaut-application website Monday. It's accepting applications through Feb. 18.

Contenders need to be U.S. citizens with a bachelor's degree in science, math or engineering. Expect intense competition: More than 6,000 applied for NASA's last astronaut class in 2013, with only eight picked. It's an elite club, numbering only in the 300s since the beginning.

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Future astronauts will have four spacecraft at their disposal: the International Space Station, two commercial crew capsules to get there, and NASA's Orion spacecraft for eventual Mars trips. Pay is between $66,000 and $145,000 a year, and you'll have to move to Houston.